Available data and experimental setup
The measurements were performed by Ravitej Uppu and Pepijn Pinkse from the Complex Photonic Systems group at the university of Twente.
Two different Physical Uncloanable Functions (PUFs) were measured with the setup shown below. Participants of the contest will be provided with light intensity measurements corresponding to different challenges, as well as the Spacial Light Modulator (SLM) configuration for all the challenges.
Laser light in vertical polarization (power 0.7 mW, wavelength 790nm) passes through the SLM. The SLM modulates the phase of the incoming light differently for squares of 10x10 pixels. The SLM is 800x600 pixels with a pixel size of 20 micrometers. Only part of the SLM is used as can been seen in the SML configuration that will be provided. The PUF consists of 13 micrometer thick spray-painted ZnO nanoparticles on a glass substrate of 170 μm thick. The glass substrate is towards the input objective and the bare sample faces the output lens. The collection objective is an infinity-corrected 0.95 NA, 63x magnification lens. The sample surface is located at 170 micrometer from the collection lens. After passing through a polarizing beam splitter which separates the horizontally and vertically polarized light, the light passes through a plano-convex lens with f = +200 mm, at a distance of âfâ from the CCD chip. The image magnification with the 200 mm focal length lens is ~76x. There is a non-polarizing 50:50 beam splitter in the path towards the CCD for horizontal polarization (not shown) which necessitates twice the exposure time for the horizontal polarization. The CCD is 388 by 1038 pixels with a pixel pitch of 6.45 micrometer. The image formed on the camera is about 4.5 mm which corresponds to about 62 micrometers on the PUF. Horizontally and vertically polarized light are measured simultaneously. All provided data will be measurements of the horizontal polarization.
Experimental configuration:
Sample: ZnO nanoparticulate medium (~13 micrometer thick).
Wavelength: 790nm
SLM pixel pitch: 20 micrometers
Transmission collected with a 0.9 NA objective.
Image size on the camera: ~700 pixels.
Camera pixel pitch: 6.45 micrometers.
Approximate image size ~ 4.5 mm.
Approximate size of transmitted speckle at the back of the sample: ~62 micrometers.
Exposure time: ~1470 microseconds (horizontal polarization)
Speckle images
Two raw speckle images are shown as examples. Both are from the same PUF but with different incident angles. The images will be provided in the bitmap (bmp) format. The size of the images is 801x821 pixels and about 660kb.
